<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item> 添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"> </el-alert>

            <!-- 步骤条 -->
            <el-steps :space="1000" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- TAB栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClick">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label=" 商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label=" 商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label=" 商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label=" 商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>

                        <el-form-item label=" 商品分类" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item v-for="item in manyTabData" :key="item.attr_id" :label="item.attr_name">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox v-for="(cb, i) in item.attr_vals" :key="i" :label="cb" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                            <!-- 渲染表单 -->
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action：图片要上传到的api接口 -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"> </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg" />
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash';

export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                attrs: [],
            },
            addFormRules: {
                goods_name: [
                    {
                        required: true,
                        message: '请输入商品名称!',
                        trigger: 'blur',
                    },
                ],
                goods_price: [
                    {
                        required: true,
                        message: '请输入商品价格!',
                        trigger: 'blur',
                    },
                ],
                goods_weight: [
                    {
                        required: true,
                        message: '请输入商品重量!',
                        trigger: 'blur',
                    },
                ],
                goods_number: [
                    {
                        required: true,
                        message: '请输入商品数量!',
                        trigger: 'blur',
                    },
                ],
                goods_cat: [
                    {
                        required: true,
                        message: '请选择商品分类!',
                        trigger: 'blur',
                    },
                ],
            },
            // 商品分类列表
            cateList: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover',
            },
            // 商品参数列表数据
            manyTabData: [],
            // 商品属性列表数据
            onlyTabData: [],
            // 上传图片的url地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传图片组件的请求头
            headerObj: {
                Authorization: window.sessionStorage.getItem('token'),
            },
            previewPath: '',
            previewVisible: false,
        };
    },
    created() {
        this.getCateList();
    },
    methods: {
        // 获取所有商品分类
        async getCateList() {
            const { data: res } = await this.$http.get('categories');

            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据列表失败！');
            }

            this.cateList = res.data;
            // console.log(this.cateList);
        },
        // 级联选择器，选中项变化
        handleChange() {
            // console.log(this.addForm.goods_cat);
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = [];
            }
        },
        beforeTabLeave(activeName, oldActiveName) {
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类！');
                return false;
            }
        },
        // TAB切换触发的函数
        async tabClick() {
            // console.log(this.activeIndex);
            // 访问的是商品参数面板
            if (this.activeIndex === '1') {
                // console.log(1);
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: 'many',
                    },
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品参数失败！');
                }
                // console.log(res.data);
                res.data.forEach((item) => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',');
                });
                this.manyTabData = res.data;
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: 'only',
                    },
                });

                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品属性失败！');
                }

                // console.log(res.data);
                this.onlyTabData = res.data;
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            // console.log(file);
            this.previewPath = file.response.data.url;
            this.previewVisible = true;
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // console.log(file);
            // 获取将要删除的图片路径
            const filePath = file.response.data.tmp_path;
            // 在pics数组中找到索引值
            const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
            // 调用数组方法，把对象从pics中删除
            this.addForm.pics.splice(i, 1);
            // console.log(this.addForm);
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            // console.log(response);
            // 拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path };
            // 将图片信息push到pics数组中
            this.addForm.pics.push(picInfo);
            // console.log(this.addForm);
        },
        // 添加商品
        add() {
            // console.log(this.addForm);
            this.$refs.addFormRef.validate(async (valid) => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项！');
                }
                // 执行添加的业务逻辑
                // 深拷贝
                const form = _.cloneDeep(this.addForm);
                form.goods_cat = form.goods_cat.join(',');
                // 处理动态参数
                this.manyTabData.forEach((item) => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' '),
                    };
                    this.addForm.attrs.push(newInfo);
                });
                // 处理静态属性
                this.onlyTabData.forEach((item) => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals,
                    };
                    this.addForm.attrs.push(newInfo);
                });
                form.attrs = this.addForm.attrs;
                // console.log(form);

                // 发起请求，添加商品
                // 商品名称，唯一
                const { data: res } = await this.$http.post('goods', form);
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！');
                }
                this.$message.success('添加商品成功！');
                this.$router.push('/goods');
            });
        },
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2];
            }
            return null;
        },
    },
};
</script>


<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 15px;
}
</style>